POLYOLEFIN STEAM TREATMENT Russian patent published in 2014 - IPC C08F6/00 C08F6/02 C08F10/00 

FIELD: chemistry.

SUBSTANCE: invention relates to steam treatment of polymer particles in a steaming apparatus after a polymerisation process. The method includes contacting polymer particles with a counter-current of steam. The flow rate of steam entering said steaming apparatus is continuously maintained proportional to the production rate of said polymerisation process in and the gradient between the temperature (T_out) of the polymer exiting said steaming apparatus and the temperature (T_in) of the polymer entering said steaming apparatus. The rate of formation of polyolefin, said temperature T_out at the output and said temperature T_in at the input are determined. Said flow rate is controlled according to a value calculated using the equation: F_steam=K·F_P·ΔT_polymer, where F_steam is the flow rate (kg/h) of steam entering the steaming apparatus; F_P is the flow rate (kg/h) of polyolefin fed at the top of the steaming apparatus; ΔT_polymer=T_out-T_in (°C); K (°C)^-1 is the multiplicative constant of the steam flow rate.

EFFECT: controlling the amount of steam used to steam a polymer in a ratio with the amount of polymer entering the steaming apparatus.

9 cl, 1 dwg, 2 ex